The rejection test of UF membranes commonly does by BSA and dextran solutions. These materials have different structures and so maybe different behaviors in concentration polarization phenomena. The rejection test results are same for these two components with different molecular weights (MW of BSA =69 KDa & MW of Dextran= about 500 KDa ) although constant agitation (20 rpm) used for both of them. What is the reason !

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